One of the main causes for this issue is a corrupt system file preventing the operating system from loading, resulting in a black or blank screen. Restart Windows to see if it's a temporary issue and resolves itself with a reboot. If the problem persists, erase your hard drive and reinstall Windows.
Reboot Your Phone. Perform a Hard Reset. Boot Into Safe Mode (Android Only) Disable Auto-Brightness (Adaptive Brightness) Disable Hardware Overlays. Check for Device Updates. Get Your Phone Checked by a Professional.